In John 8, Jesus strikes up a conversation with “Jews which believed on Him.” Jesus knows they don’t, but they said they did, probably even believed they believed on Him.
Jesus says you truly believe if you keep continually in His Word. They are not continuing because the more Jesus says the more they have a desire to kill Him. By the end of the chapter, verse 59, these folks who “believed on Him” took up stones to cast at Him.
So, what gives? Jesus says in John that any man who believes in Him will not perish. These guys believed, how come Jesus says they don’t? If they believe, why do they want to kill Jesus?
Although they had faith in what they had heard, they missed one crucial element: Love. Jesus says “If God were you Father, ye would love me” (vs. 42).
Although they believed what they heard, they hadn’t heard it all. The more they heard, the less they believed. If a man loves Jesus Christ He will love hearing more of what He has to say.
They did not love Him so they did not want to hear more. Faith comes by hearing. Instead they wanted to stone Him to death.
Faith and love go together. You can’t have saving faith without love and you can’t have true love without saving faith.